xref: /openbmc/linux/arch/arm/include/asm/tlb.h (revision 151f4e2b)
1 /*
2  *  arch/arm/include/asm/tlb.h
3  *
4  *  Copyright (C) 2002 Russell King
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 as
8  * published by the Free Software Foundation.
9  *
10  *  Experimentation shows that on a StrongARM, it appears to be faster
11  *  to use the "invalidate whole tlb" rather than "invalidate single
12  *  tlb" for this.
13  *
14  *  This appears true for both the process fork+exit case, as well as
15  *  the munmap-large-area case.
16  */
17 #ifndef __ASMARM_TLB_H
18 #define __ASMARM_TLB_H
19 
20 #include <asm/cacheflush.h>
21 
22 #ifndef CONFIG_MMU
23 
24 #include <linux/pagemap.h>
25 
26 #define tlb_flush(tlb)	((void) tlb)
27 
28 #include <asm-generic/tlb.h>
29 
30 #else /* !CONFIG_MMU */
31 
32 #include <linux/swap.h>
33 #include <asm/pgalloc.h>
34 #include <asm/tlbflush.h>
35 
36 static inline void __tlb_remove_table(void *_table)
37 {
38 	free_page_and_swap_cache((struct page *)_table);
39 }
40 
41 #include <asm-generic/tlb.h>
42 
43 #ifndef CONFIG_HAVE_RCU_TABLE_FREE
44 #define tlb_remove_table(tlb, entry) tlb_remove_page(tlb, entry)
45 #endif
46 
47 static inline void
48 __pte_free_tlb(struct mmu_gather *tlb, pgtable_t pte, unsigned long addr)
49 {
50 	pgtable_page_dtor(pte);
51 
52 #ifndef CONFIG_ARM_LPAE
53 	/*
54 	 * With the classic ARM MMU, a pte page has two corresponding pmd
55 	 * entries, each covering 1MB.
56 	 */
57 	addr = (addr & PMD_MASK) + SZ_1M;
58 	__tlb_adjust_range(tlb, addr - PAGE_SIZE, 2 * PAGE_SIZE);
59 #endif
60 
61 	tlb_remove_table(tlb, pte);
62 }
63 
64 static inline void
65 __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmdp, unsigned long addr)
66 {
67 #ifdef CONFIG_ARM_LPAE
68 	struct page *page = virt_to_page(pmdp);
69 
70 	tlb_remove_table(tlb, page);
71 #endif
72 }
73 
74 #endif /* CONFIG_MMU */
75 #endif
76